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jscript: Don't allow changing prototype on non-extensible objects. 

Signed-off-by: Gabriel Ivăncescu <gabrielopcode@gmail.com>
Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Gabriel Ivăncescu 2022-03-21 17:58:32 +02:00 committed by Alexandre Julliard
parent 7858f87ae5
commit 429325b689
6 changed files with 16 additions and 0 deletions
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2
dlls/jscript/dispex.c
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@ -2713,6 +2713,8 @@ HRESULT jsdisp_change_prototype(jsdisp_t *obj, jsdisp_t *proto)
if(obj->prototype == proto)
return S_OK;
if(!obj->extensible)
return JS_E_CANNOT_CREATE_FOR_NONEXTENSIBLE;
for(iter = proto; iter; iter = iter->prototype)
if(iter == obj)

1
dlls/jscript/error.c
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@ -478,6 +478,7 @@ jsdisp_t *create_builtin_error(script_ctx_t *ctx)
case JS_E_REGEXP_EXPECTED:
case JS_E_ARRAY_EXPECTED:
case JS_E_CYCLIC_PROTO_VALUE:
case JS_E_CANNOT_CREATE_FOR_NONEXTENSIBLE:
case JS_E_OBJECT_NONEXTENSIBLE:
case JS_E_NONCONFIGURABLE_REDEFINED:
case JS_E_NONWRITABLE_MODIFIED:

1
dlls/jscript/jscript.h
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@ -519,6 +519,7 @@ static inline DWORD make_grfdex(script_ctx_t *ctx, DWORD flags)
#define JS_E_INVALID_LENGTH MAKE_JSERROR(IDS_INVALID_LENGTH)
#define JS_E_ARRAY_EXPECTED MAKE_JSERROR(IDS_ARRAY_EXPECTED)
#define JS_E_CYCLIC_PROTO_VALUE MAKE_JSERROR(IDS_CYCLIC_PROTO_VALUE)
#define JS_E_CANNOT_CREATE_FOR_NONEXTENSIBLE MAKE_JSERROR(IDS_CREATE_FOR_NONEXTENSIBLE)
#define JS_E_OBJECT_NONEXTENSIBLE MAKE_JSERROR(IDS_OBJECT_NONEXTENSIBLE)
#define JS_E_NONCONFIGURABLE_REDEFINED MAKE_JSERROR(IDS_NONCONFIGURABLE_REDEFINED)
#define JS_E_NONWRITABLE_MODIFIED MAKE_JSERROR(IDS_NONWRITABLE_MODIFIED)

1
dlls/jscript/jscript.rc
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@ -71,6 +71,7 @@ STRINGTABLE
IDS_ARRAY_EXPECTED "Array object expected"
IDS_INVALID_WRITABLE_PROP_DESC "'writable' attribute on the property descriptor cannot be set to 'true' on this object"
IDS_CYCLIC_PROTO_VALUE "Cyclic __proto__ value"
IDS_CREATE_FOR_NONEXTENSIBLE "Cannot create property for a non-extensible object"
IDS_OBJECT_NONEXTENSIBLE "Cannot define property '|': object is not extensible"
IDS_NONCONFIGURABLE_REDEFINED "Cannot redefine non-configurable property '|'"
IDS_NONWRITABLE_MODIFIED "Cannot modify non-writable property '|'"

1
dlls/jscript/resource.h
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@ -69,6 +69,7 @@
#define IDS_ARRAY_EXPECTED 0x13A7
#define IDS_INVALID_WRITABLE_PROP_DESC 0x13AC
#define IDS_CYCLIC_PROTO_VALUE 0x13B0
#define IDS_CREATE_FOR_NONEXTENSIBLE 0x13B6
#define IDS_OBJECT_NONEXTENSIBLE 0x13D5
#define IDS_NONCONFIGURABLE_REDEFINED 0x13D6
#define IDS_NONWRITABLE_MODIFIED 0x13D7

10
dlls/mshtml/tests/documentmode.js
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@ -1403,6 +1403,16 @@ sync_test("__proto__", function() {
ok(e.number === 0xa13b0 - 0x80000000 && e.name === "TypeError",
"setting circular proto chain threw exception " + e.number + " (" + e.name + ")");
}
Object.preventExtensions(x);
x.__proto__ = Object.prototype; /* same prototype */
try {
x.__proto__ = Number.prototype;
ok(false, "expected exception changing __proto__ on non-extensible object");
}catch(e) {
ok(e.number === 0xa13b6 - 0x80000000 && e.name === "TypeError",
"changing __proto__ on non-extensible object threw exception " + e.number + " (" + e.name + ")");
}
});
async_test("postMessage", function() {